Environmentalists are working to preserve another priceless natural treasure, one that has been on this earth supporting its habitat for, uh, decades. From the Save the Salton Sea web site:

The
proposed transfer of water from the Imperial Valley to San Diego as
part of the reduction of California's Colorado River use, the possible
reclamation of New River water by Mexico, and the increased evaporation
from the Sea's restoration all threaten to reduce lake levels. The
proposed transfer of the 300,000 acre feet alone, if inflows are not
replaced, is estimated to drop lake levels by over 16 feet, exposing
almost 70 square miles of sediments. The result could be potential air
quality problems caused by blowing dust, seaside homes stranded far
from the Sea, and greatly accelerated concentrations of salts and
nutrients.

Of course its freaking drying up. In a sense, this lake represents the United States' largest industrial spill, as early in the 20th century a couple of Colorado River aqueducts broke and poured water into the Salton basin, creating a brand new sea. By usual environmentalist arguments, this lake is supposed to dry up, having been an artificial creation of man. (By the way, as an extra credit task, I challenge you to find anywhere in the web site linked above where they mention that the lake is a man-made accident that is barely 100 years old).